Hollow bolt anchor knot composition and what structure that?

　　Bolts are the basic component of modern coal mine roadway support. It strengthens the surrounding rock of the roadway and supports itself. The composition of the anchor rod must have several factors:

　　1. A pole with higher tensile strength than rock and soil.

　　2. One end of the rod can be in close contact with rocks and soil to form friction (or bonding) resistance.

　　3. The other end of the rod outside the rock and soil will form a radial resistance to the rock and soil.

　　Hollow bolt principle: Bolt as deep underground formations tensile member having one end connected to the engineering structure, the other end of the deep underground. The entire anchor rod is divided into a free part and an anchor part. The free section refers to the pulling force of the anchor head to the anchoring area, and its function is to prestress the anchor rod. The anchorage section refers to the area where the cement paste combines the prestressed tendons and the soil layer. Its function is to increase the combined friction between the anchor and the soil, improve the bearing effect of the anchor, and transfer the tension of the free part to the depth of the soil.

　　Hollow bolt is the most widely used bolt

　　The classification of anchor points is as follows:

　　1. Wooden anchor. There are two types of wooden bolts used in our country, namely ordinary cork and compressed cork. The following are several types of title anchors.

　　2. Steel rod or wire rope mortar anchor. Cement mortar is used as an adhesive between bolts and surrounding rock.

　　3. Inverted wedge-shaped metal anchor. This anchor rod was once one of the most widely used bolt forms. Because of its simple processing, convenient installation, strong anchoring force and other advantages, it is still used in a certain range so far.

　　4. Pipe joint anchor rod. It is a full-length friction anchor rod, which has the characteristics of simple installation, reliable anchoring, large initial anchoring force, and long-term anchoring force increasing with surrounding rock movement.

　　5. Resin bolts. The cost of using resin as an anchor rod adhesive is relatively high.

　　6. Quickly harden the expansion cement bolts. Ordinary Portland cement or slag Portland cement mixed with additives has the characteristics of rapid setting, early strength, water reduction and expansion.

　　7. Double fast cement anchors. It is composed of a certain proportion of finished early-strength cement and double fast-setting cement, which has the characteristics of fast hardening, fast setting and early strength.

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